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Time Period Independent of Amplitude

The motion of...

Question

The motion of a mass $m$ attached to a spring of spring constant $k$ is shown in the figure. The net force on the spring is

F_{s p r i n g} = - k x

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F_{s p r i n g} = - k x + m g

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F_{s p r i n g} = k x - m g

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F_{s p r i n g} = k x + m g

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Solution

The correct option is A $F_{s p r i n g} = - k x$
$F_{s p r i n g} = m (a - g)$
The only force acting on the spring is tension force wich is equalt to $- k x$ wich in turn is equal to $m (a - g)$

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